Home / mailings [gentoo-announce] [ GLSA 202405-19 ] xar: Unsafe Extraction
Posted on 07 May 2024
Gentoo-announce- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory GLSA 202405-19
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
https://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Normal
Title: xar: Unsafe Extraction
Date: May 07, 2024
Bugs: #820641
ID: 202405-19
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Synopsis
========
A vulnerability has been discovered in xar, which can lead to privilege
escalation.
Background
==========
xar provides an easily extensible archive format.
Affected packages
=================
Package Vulnerable Unaffected
------------ ------------------- --------------------
app-arch/xar < 1.8.0.0.487.100.1 >= 1.8.0.0.487.100.1
Description
===========
A vulnerability has been discovered in xar. Please review the CVE
identifier referenced below for details.
Impact
======
xar allows for a forward-slash separated path to be specified in the
file name property, e.g. <name>x/foo</name> – as long as it doesn't
traverse upwards, and the path exists within the current directory. This
means an attacker can create a .xar file which contains both a directory
symlink, and a file with a name property which points into the extracted
symlink directory. By abusing symlink directories in this manner, an
attacker can write arbitrary files to any directory on the filesystem –
providing the user has permissions to write to it.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All xar users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-arch/xar-1.8.0.0.487.100.1"
References
==========
[ 1 ] CVE-2021-30833
https://nvd.nist.gov/vuln/detail/CVE-2021-30833
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/202405-19
Concerns?
=========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.
License
=======
Copyright 2024 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).
The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.
https://creativecommons.org/licenses/by-sa/2.5
--===============4092398405742594262==Content-Type: application/pgp-signature; name="signature.asc"
Content-Description: OpenPGP digital signature
Content-Disposition: attachment; filename="signature.asc"
